Evaporating-pan



(No Model.) 3- ShQets-Shqet 2.

v I R I EVAP ORATI NG PAN. No. 501,848. Patented July 18 1893.,

3 Sheets-Sheet s.

(No Model.)

B, R. SHAW. 'EVAPORATING PAN;

No. 501,848. Patefited July 18, 1893;

UN T D STATES PATENT OFFICE.

ELTON R. SHAW, OF LOS GATOS, CALIFORNIA.

EVAPORATING-PAN.

JPEGIFIGATION forming part of Letters Patent No. 501,848, dated July 18, 1893.

Application filed January 12 1893. Serial No. 458,182. (N 0 model.)

There are many liquids, notably saccharine liquids, in which deleterious chemical changes take place at ornear their normal boiling point. It is the object of this invention to avoid such changes and to provide simple means for rapidly evaporating liquids at a low degree of heat, and with mechanism that is easily controlled and readily cleansed from scale or other dirt.

The essential parts of the invention are one or more rotating cylinders, which may be made of metal, paper, glass, or other substance, incased in a tight jacket, which may be filled with water, steam, hot air, or other vapor, or liquid, and an exhaust fan for creating a current of air through the cylinder or cylinders.

The apparatus represented in the accompanying drawings shows a jacket containing two cylinders, but any number of cylinders may be placed in the same jacket, such jacket with its accompanying cylinders constituting an effect.

The means by which the object stated is sought to be accomplished may be described as follows.

- Reference being had to the accompanying drawings, Figure 1 is a part side elevation and part sectional view. Fig. 2 is a sectional end View on the line w0c of Fig. 1. Fig. 3 is a front or discharge end elevation. Figs. 4 and 5 aredetail views showing the jacket arranged Owhich is incased in non-conducting material to prevent the outside radiation of heat.

D represents an exhaust fan supported in, and forming the only outlet for air of the housing E.

F F F are longitudinal stays holding the packing heads of the jacket in place.

G G are screws for giving greater or less inclination to the apparatus.

H represents an expansion dome through which water or other liquid is introduced inside the jacket, and which allows for the expansion or contraction of such liquid under varying degrees of heat.

The expansion dome is to be closed with a safety valve, when steam or other vapor 1s used inside the jacket.

I is a guide pulley which prevents the longitudinal travel of the cylinders.

Having thus explained the principal parts of the invention, I will proceed to describe its operation. The space surrounding the cylinder, inside the jacket,having been filled with water heated by means of the steam coils J J, or otherwise, power is applied to the pulley K, which transmits motion to the shaft K, the sprockets K K the link chains K K, and the sprocket rings K K attached to the cylinder, causing the cylinder to revolve in its tight bearings. Power is also applied to the fan at the fan pulley D which immediately draws a strong current of air, either heated artificially, or of normal temperature, through the revolving cylinder. The liquid to be evaporated is now fed by the rotary pump L through the tube L into the upper or elevated end of the cylinder where, as it falls in a continuous stream upon the inner moving surface, it is picked up and spread out in a sheet or film by the natural adhesiveness of the liquid, combined with the centrifugal force produced by the revolutions of the cylinder. The thick ness of the film and the forward movement of the liquid are absolutely controlled by the speed of revolution combined with the inclination of the cylinder and the density of the liquid. As the liquid spreads over the inner surface of the cylinder, it is acted upon on its side, next to the cylinder,by the heat radiated from the hot water or other heating agent, in the jacket, and upon its surface it is acted ICO upon by the current of dry air passing through the cylinder. The bulk of the water having been removed from the liquid in its progress through the cylinder, the condensed product falls from the lower end of the cylinder into the funnel M, thence into the hydrometer vase N, from which it is conducted to a suitable receptacle.

The application of the evaporative agent to the inner surface of the film of material within the cylinder, need not necessarily be by means of a current of air drawn through, for it is obvious that a vacuum, more or less complete, produced in the cylinder will serve the purpose.

I do not confine myself to making the cylinder rotate within the jacket, for as shown in Figs. 4 and 5, the jacket 0 may be arranged to rotate with the cylinder. In these figures the jacketed cylinder has a ring 0 resting on bearing wheels 0' and the evaporative agent is supplied to the jacket through a pipe 0 having a packed joint 0 Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

A liquid evaporator consisting of a rotating cylinder inclined in the direction of its length, means for supplying the liquid to the head end of the cylinder, whereby it spreads out in a thin film therein, and is gradually advanced through the cylinder, a receiver at the foot of the cylinder to receive the condensed liquid, a tight jacket surrounding the cylinder and adapted to receive an evaporative agent whereby the side of the film next to the cylinder is acted upon, and afan opposite the head end of the cylinder for creating an evaporative air current through the cylinder, to act upon the inner side of the film, substantially as herein described.

In witness whereof I have hereunto set my hand.

ELTON R. SHAW.

Witnesses:

S. H. NOURSE, J. A. BAYLESS. 

